Delete row sig_8ba74ff99f7c from signals

id sig_8ba74ff99f7c
event_id evt_a78f1cd62e70
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_9263970f0 ...
dedupe_key signal_enriched:news_delta:a47bbd9f212974b8
throttle_s 0
created_at 2026-04-17T23:51:13.980947+00:00
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